I have a habit of collecting parts. I'm a newbie to Mustangs and my 66 is my first car resto. I have access to a 9" rear out of a '77 Lincoln Versailles, my car already has a 9" rear in it but I can get this one dirt cheap, do I take it?

I want to convert my brakes to discs, is there anything on the Versailles that I could use?

 

I'd stick with the stock 9" it has in it now, I don't know about the Versilles 9 it may be wider than what you need. Any ways it would just be easier to keep the 9 in it and convert it to 5 lug disk, at least that is what I would do.